I have had 2 episodes 2 days in a row of dark blood, almost black in appearance, about a tablespoon in amount, coming from my vagina. I have had a complete hysterectomy, no ovaries left, nothing, about 7 years ago. What could be wrong with me.

You need to seek medical advice and get someone to properly check you out. Don't be scared, but you need to find out what is wrong stop this from happening. The dark blood shows it's been pooling for a while rather than a fresh bleed, so it could be an old wound/scar weakened for instance. They'll probably do an ultrasound and pelvic exam. I wish you all the best. Be sure to let us know how you are xx